<?php

namespace Des;
	class JoDES {
	 
	    private static $_instance = NULL;
	    /**
	     * @return JoDES
	     */
	    public static function share() {
	        if (is_null(self::$_instance)) {
	            self::$_instance = new JoDES();
	        }

	        return self::$_instance;
	    }

	    /**
	     * 加密
	     * @param string $str 要处理的字符串
	     * @param string $key 加密Key，为8个字节长度
	     * @return string
	     */
	    public function encode($str, $key) {
	        $size = mcrypt_get_block_size(MCRYPT_DES, MCRYPT_MODE_CBC);
	        $str = $this->pkcs5Pad($str, $size);
	        $aaa = MCRYPT_ENCRYPT(MCRYPT_DES, $key, $str, MCRYPT_MODE_CBC, $key);
	        $ret = base64_encode($aaa);
	        return $ret;
	    }

	    /**
	     * 解密
	     * @param string $str 要处理的字符串
	     * @param string $key 解密Key，为8个字节长度
	     * @return string
	     */
	    public function decode($str, $key) {
	        $strBin = base64_decode($str);
	        $str = MCRYPT_DECRYPT(MCRYPT_DES, $key, $strBin, MCRYPT_MODE_CBC, $key);
	        $str = $this->pkcs5Unpad($str);
	        return $str;
	    }

	    function hex2bin($hexData) {
	        $binData = "";
	        for ($i = 0; $i < strlen($hexData); $i += 2) {
	            $binData .= chr(hexdec(substr($hexData, $i, 2)));
	        }
	        return $binData;
	    }

	    function pkcs5Pad($text, $blocksize) {
	        $pad = $blocksize - (strlen($text) % $blocksize);
	        return $text . str_repeat(chr($pad), $pad);
	    }

	    function pkcs5Unpad($text) {
	        $pad = ord($text {strlen($text) - 1});
	        if ($pad > strlen($text))
	            return false;

	        if (strspn($text, chr($pad), strlen($text) - $pad) != $pad)
	            return false;

	        return substr($text, 0, - 1 * $pad);
	    }
	 
	}